Grande Ile Bois Mangue, British Indian Ocean Territory offers 1 beach perfect for sunbathing, surfing, swimming, and more. Grande Ile Bois Mangue is known for its pristine beaches and the Chagos Archipelago's unique marine biodiversity. The best time to travel to Grande Ile Bois Mangue, British Indian Ocean Territory, is from May to October, with average air temperatures around 27°C (81°F) and water temperatures near 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!